<!doctype html>
<html>

<head>
    <title>Todo App: Gun + Vue</title>
    
    <script src="https://unpkg.com/vue" type="text/javascript" charset="utf-8"></script>
    <script src="https://cdn.jsdelivr.net/npm/gun/gun.js" type="text/javascript" charset="utf-8"></script>
    <link href='https://fonts.googleapis.com/css?family=Alegreya+Sans:300italic' rel='stylesheet' type='text/css'>
    <style>

        body,
        html {
            width: 100%;
            font-family: 'Alegreya Sans', sans-serif;
        }

        body {
            font-size: 20px;
            background-color: rgba(0,0,0,.3);
        }

        h1,
        h3,
        h5 {
            text-transform: uppercase;
            font-weight: 600;
        }

        #app {
            margin: 0 auto;
            background-color: #fff;
            max-width: 500px;
            padding: 2em;
        }

        .add-todo {
            font-size: 1em;
            border: 1px solid black;
            padding: .5em .25em;
        }

        .completed-header,
        .completed,
        .completed-time {
            color: rgba(0,0,0,.3);
        }

        .completed {
            text-decoration: line-through;
        }

        .completed-time {
            font-size: .8em;
        }
    </style>
</head>

<body>

<div id="app">

    <div class="todo-wrapper">
        <h1>Todos App</h1>

        <input class="add-todo" type="text" placeholder="Add new todo" v-model="newTodo" @keyup.enter="addTodo">

        <h3>Active</h3>

        <div v-for="active in activeTodos">
            <label><input type="checkbox" @click.prevent="completeTodo(active.key)"> {{ active.todo.description }}</label>
        </div>

        <h5 v-show="completedTodos.length > 0" class="completed-header">Completed</h5>
 
        <div v-for="completed in completedTodos" @click="reopenTodo(completed.key)">
            <span class="completed">{{ completed.todo.description }}</span>
            <span class="completed-time">(completed at {{ (new Date(completed.todo.completed)).toUTCString() }})</span>
        </div>
    </div>

</div>

</body>

<script>

// Clear out local storage so we can start fresh each time.
localStorage.clear();


// No peers for the sake of example,
// but this could easily be a collaborative 
// todolist by adding a few peers
var gun = new Gun();
var todos = gun.get('todos');

new Vue({
    data: {
        todos: [],
        newTodo: ""
    },
    computed: {
        activeTodos: function() {
            return this.todos.filter(function(todo) {
                return todo.todo.completed === '';
            });
        },
        completedTodos: function() {
            return this.todos.filter(function(todo) {
                return todo.todo.completed !== '';
            });
        }
    },
    methods: {
        todoUpdated: function(todo, nodeKey) {
            if (/\D/.test(nodeKey)) {
                return;
            }

            var existingTodoIndex = this.todos.findIndex(function(todo) {
                return todo.key === nodeKey
            });
            var todoToStore = {
                todo: todo,
                key: nodeKey
            };
            if (existingTodoIndex === -1) {
                this.todos.push(todoToStore);
            } else {
                this.todos.splice(existingTodoIndex, 1, todoToStore);
            }
        },
        addTodo: function() {
            var newTodo = todos.get(Date.now().toString());
            newTodo.put({
                description: this.newTodo,
                completed: ''
            });
            todos.set(newTodo);
            this.newTodo = "";
        },
        completeTodo: function(key) {
            todos.get(key).put({
                completed: Date.now()
            });
        },
        reopenTodo: function(key) {
            todos.get(key).put({
                completed: ''
            });
        }
    },
    mounted: function() {

        // Subscribe to updates on the todos set
        todos.map().on(this.todoUpdated.bind(this));
    }
}).$mount('#app');

</script>

</html>
